Method of and apparatus for making bags



A. 'POTDEVRN METHOD AND APPARATUS FOR MAKING BAGS Filed July 51, 1940 2 sheets-she et l INVENTOR M Wm 6 r @4 1 MI ATTORNEYS.

June 2, 1942..

A. IPOTDEVIN 2,28,22

METHOD AND APPARATUS FOR MAKING BAGS Filed July 31, 1940 2 Sheets-Sheet 2 INVENTOR ATTORNEYS Fatented. June 2, 1942 assigns {Adolph rotse vm, Garden city, N. 1n, assignor to Potdevi'n Machine Company, Brooklyn, N. Y., a corporation of New York Application July 31 1940, Serial No. 348,664 17 Claims. (Cl. re -s45) This invention relates to improvements in bag making, both in method and apparatus.

More specifically my invention relates to improved methods and apparatus for making bags such as shown and described in Snyder Patent 1,265,270 of May '7, 1918, wherein the bag is identical with that of Poppe Patent 1,952,891 of March 27, 1934; a further object of my inventime being the production of this bag on machines of the general type disclosed by Potdevin Patents 1,941,272, dated December 26, 1933, and.

2,087,704, dated July 20,1937.

More specifically my invention relates to the perforating of the material in the web, tubing and separating the tubing into bag lengths.

After the tubing is divided into bag lengths,

' the latter may be pasted, folded and completed asset out, for example, in the Snyder patent,

above referred to, page 2, column 1, beginning line 20. In the accompanying drawings wherein I have illustrated an embodiment of my invention:

Fig. 1 is a somewhat diagrammatic view of a machine suitable for the practice of the invention;

Fig. 2 is an elevational view of the perforating mechanism;

Fig. 3 is a view in perspective of the perforating roll; and

Fig. 4 is an isometric view of the mechanism.

for dividing or separating the perforated tubing into bag lengths.

Referring to the drawings in detail: 2 designates a supply roll from which the web of material t is continuously drawn in practicing my invention.

The .web a passes from the supply roll fi about guide roll 6 over support and feed roller d, between friction feed roller 8 and frictionally driven platen roller it, and between the platen roller it and perforating roller 52 to guide roll It, around the roller it to the tube forming shoe It and to the main feed or forwarding rolls 2E and 22.

The roll 3, already referred to, and roll 2% of the perforating mechanism are driven at the same surface speed as the main feed or forwarding. rolls 20 and 22 and feed rolls 38 and it.

The platen roll it of the perforating mechanism is rubber covered and is frictlonally driven by its contact with the rolls 8 and 2d.

The perforating roll '22 is provided with a perforating or weakening knife 26 which may be of any desired shape, depending upon the bag to be made, and it will be understood, of course,

that this roll will be of the proper diameter to correspond with the desired tube length, the

perforating knife perforating the web t at bag length intervals.

' The nest of rollers 8, it and 2c is adjustable as a unit toward and away from the perforating roller 82 to get the correct setting for proper perforating and to accommodate perforators of different diameters. This adjustable feature also compensates for changed diameters of the rubher-covered platen roller it.

The roller ii] is independently adjustable with respect to the rollers 8 and it.

It will be seen from an inspection of Fig. 2 that the nest of rollers 8, it} and it is carried in an adjustable mount 28, and by loosening the wheel 30 and adjusting the rod 32 the roller nest may beadjusted as a unit toward or away from the perforating roller E2. The rubber-faced roller if) is adjustable independently relative to the rollers 8 and 2t and with respect to perforating roller l2 through the adjusting rod 3%.

A throw-off 36 is provided for the roll 8 to separate it from the roller it to provide for threading the machine. The roller ill, as above mentioned, is friction driven, and may be of any desired diameten' For purposes of economy I prefer to make it rather small and inasmuch as this roller is subject to wear from the perforating knife, it will be evident that unless some provision is made to avoid it, replacement of the roller it] would be frequent. By my construction this necessity is avoided. The roller is frictionally driven from the rollers d and 25, either one or both, so that it automatically adjusts itself to the surface speed of these rollers, these. rollers, the rollers t and 2t, backing the roller Hi to resist the pressure of the perforating knife 26. Due to this construction, therefore, the roller it may be resurfaced by times without renewing it. 1

As above mentioned, the web after being perforated is fed to the tubing shoe iii and' to the forwarding rollers 20 and 22.

The tubing is fed by the forwarding rollers to separating mechanism which separates the tubing at the perforations or weakened areas into bag lengths. Various mechanisms have been suggested to separate bag tubing into bag lengths.

turning, grinding or otherwise, any number of "The most common practice is to accelerate the tubing at somepoint between the forwarding rollers and the bottoming mechanism. However, as each bag machine is designed to make bags of many lengths, the surface speed of the feed ins, e greater or lose 7 sting or iorwe rd movement becomes very eccelerenns device very with. For instance, in those machines in silxcd orbit suddenly comes in engagement wish the advancing Thfi3= forward pull is exerted upon the tubing. When'the bug tubing reocwshe upper or long lixnii; oi one machine she ncoeler with the tube speed by the forwarding rolls, and ii the tubing is of strong texture sepsration may noioccur ell-sill.-

n the other hand. whenihe short or lower limit of the machine is opprcecned seperotlon oi the maleriol is often lmproperw effecsed in shot rup= -ture of the meteriel may occur odjeoent the us celeroting device ii the mnteriel being operated uponis of delicese censure.

This trouble is overcome with my arrangement wherein no siiempi is made to accelerate the tubing, but wherein n pressure is exerted on the tubing at opposite feces oi the some at each side of'the weakened line and in opposed directions. As will be seen from the descrlpiionwhlch follows, this provides that the some effort is up plied to the tubing to sepereile the some at the perforations throughout the whole bag length range for which the machine is designed.

Referring to Figs. .1 and e of the drawings it is to be noted thct the feed rollers 2d and 2b ed= vance the tubing which beg length lniervals while in the web, and feed rollers so and dd periodically contact the advanclug tubing and forward it in beglengchs to the bottoming mechanism d2. The surface speed of these feed rollers is the some as the surface speed of the forwarding rollers 2d and 22.

Intermediate these two pairs or sets of rollers .13 the separating mechanism for separating the tubing at the perforations or weakened line therein, thereby to separate me tubing into beg lengths. This mechanism comprises s pair of rollers dd ended carrying separating bars 38 and on extending transversely of thebeg tubing. These rollers are geared together by gears 52 d and rotate at one revolution per tube length. The shaft for the roller 5% curries another gear 56 meshing with gear 68 on the shaft so carrying some 62 for raising and lowering of the roller 38 once for each bag length. As above pointed out, the surface speed of the feed rollers 28 end 22 is the some as the surface speed of the feed rollers 3B and so.

It is believed that the operation of the machine will now be understood.

As the web d passes through the perforating length intervals while fora/bed web .then mechanism. forwordlng rollers and 22, through the separating mechanism and forwarding rollin the web. The perers 38 and so. the latter gripping the leading end of the tubing just before the separating mechanism goes into action. After separation the bag lengths are advanced to the bottoming mechanisrn 42 by the rollersdd ended. As above pointed out, the -rollers 4% and as carrying theiseparating bars 68 and 5d are rotating in opposite directlons and at the same speed,- and the web to be separated is advanced between rollers by the forwarding rollers 20, 22 and 38, so which have the same surface so that the bar M will. engage. the tubing at its upper face has been perforated at.

and.

advances through the tubing- 4 guise 811d the SL1?" win. announces in no in no mllm shown in Fig. i ere somewhei; below and shove n straight line exlreudini, irom betw'em inc lorwerdlne rollin on 'wwerd of:

ore fill, 22 so oebwem the lorwordiug rollers 538 and en; flonsmuenilr es the tubing extends irons we we: elf rollers 2% llld 22 led lei-wording rollers so one do as dew-owned prwure will be we .shereon by the her 5%. simultaneously exerted by her be thereby is separate the tubing clone the line of periorenone. we so and 53 are edjusioble with rapeci; so the holders l6 and 5d and my be set in suit the material being separation of man. flows 92 are filmed so thee roller 38 releeses the length no bottoming pornon 63% lakes hold of it.

wi l be quite oppereni; that this provides for the inning withoub any sccelersiion or. the tubin the tub ng. do n conseouence ll sun able to run the machine through one whole rouge oi bog lengths ior which is is designed, with the cssur= once that the scpersizing opere sion will be the some for ell-lengths from menimum to E1311 mum, so the-t separation surely be eilected no one perioretions or wencened porncn oi? the tubing regardless oi the texture oi the material oi the tubing,

ll. is to be understood the-ii enlistees may be mode in the details oi construfi and arrangement oi ports hereinebove deswibed without deand scope of my invenpnrtlns iron: the spirit' lion. 1 What I cleim is:

.1. In the sepsroi-ing lengths, the method whim comprises imposing downward pressure upon one face of the tubing at one side of e weakened lnle in the tubing and upon the other lace simultaneously imposing an upward pressure oi the tubing at the other side of the wenkened line while the lmblng is moving iorword to separate the tubing along said weazened line. Y

2. In the separating of bug tubing into bag lengths, the method which comprises imposing presures simultaneously in opposite directions upon the two faces oi the tubing at each side of a weakened llneiherein while the tubing is adand at the some time the bar 50 will engage voncing to separate the tubing -materlnl at either side-of the along the weakcued line. 3." The method of separating material slung a weulrened line therein. which method comprises imposing pressure upon one lace 02 the material while the material is being forwarded at one side of the weakened line while imposing pressure in the opposite direction upon the material at the opposite side of the weakened line and without changing the rate oi forwarding.

i. The method-o! separating material along a. weakened line therein, which method comprises imposing pressure in opposite directions to the opposed. feces of e tout length of the material and to each side of the weakened line to separate the some at a. weakened line while the material is being advanced. I V

5. The method oi separating material along a. weakened line therein, which method comprises imposing pressure nt-ecch side of the weakened line and in opposite directions to the two faces of the material is being forwarded by forwarding rollers which clamp the material while the of the pressure.

6. The method of separating material along a weakened line therein, which method comprises imposing pressure in opposite directions to the end without producing e sleek in of bag tubing into bog the opposite face of zone of application two faces of the material in advance and beyond the weakened line while the material is being forwarded and while the material at either side of the zone of application of the pressure is clamped.

7. The method of separating bag tubing into bag lengths along a weakened line in the tubing,

which method comprises advancing the tubing under tension through two pairs of forwarding rollers rotating at the same surface speed, and then imposing pressure upon the two faces of the tubing in opposed directions to separate the same between the two pairs of forwarding rollers.

8. The method of separating bag tubing into bag lengths along a weakened line in the tubin which method comprises advancing the tubing under tension through two pairs of forwarding rollers rotating at the same surface speed and then imposing pressure upon the two faces of the tubing in opposed directions and simultaneously at each side of the weakened line with the weakened line intermediate the two pairs of forwarding rollers, thereby to effect separation of the tubing along the weakened line.

9. The method of separating bag tubing into bag lengths at a weakened line in the tubing, which method comprises advancing the tubing at a constant speed by passing the tubing through twopairs of forwarding rollers rotating at the same surface speei', the material being under tension, and when the '..eakened linein the tubing advances to a point intermediate the two pairs of forwarding rollers rotating a separating bar into contact with opposite faces of the tubing simultaneously so that pressure is imposed upon the tubing in opposed directions substantially normal to the path of the tubing thereby to separate the tubing along the weakened line.

10. The method of separating bag tubing into bag lengths at a weakened line in the tubing, which method comprises advancing the tubing at a constant speed and with the tubing continuing its advance at this constant speed imposing rupturing tension upon the tubing near the weakened line thereby to effect the desired division.

11. In a bag making machine, mechanism for dividing bag tubing into bag lengths along a weakened line in the tubing, the combination of two pairs of forwarding rolls rotating at the same surface speed for advancing the bag tubing, and separating mechanism intermediate the forwarding rolls comprising a roller rotating adjacent each face of the tubing, said rollers rotating in opposite directions and a separating bar carried by each roller and adapted to engage the opposed faces of the tubing, said rollers being so timed with respect to the moving tubing that the separating bars will engage the tubing simultaneously, one bar engaging one face of the tubing, the other bar engaging the opposite face of the tubing at or near the weakened line.

12. In a bag making machine, mechanism for separating bag material into bag lengths along a weakened line in the material, the combination of two pairs of forwarding rollers rotating at the same surface speed for effecting the continuous advance of the bag material at a constant speed, separating mechanism intermediate the said forwarding rollers, said separating mechanism comprising a pair of rollers, each provided on its periphery with a separating bar disposed transversely of the advancing bag material, one roller lying adjacent one face of the bag material. the other roller lying adjacent the other face of the material, said bars extending into the path of the bag material, and being so disposed relatively that the bars will engage-the opposite faces of the bag material simultaneously, one bar engaging one face of the material, the other bar engaging the opposite face of the material in the region of the weakened line.

13. In a bag making machine, means for perforating the bag material, comprising in combination a perforating roller, a platen roller cooperating therewith and a driven roller for fric- ,tionally driving the platen roller.

14. In a bag making machine, means for perforating the bag material, comprising in combination a perforating roller, a platen roller coop erating therewith and a pair of driven rollers engaging the periphery of the platen roller for frictionaily driving the same.

15. In a bag making machine, means for weak- "ening the bag material at bag length intervals, comprising in combination a weakening roller, 2. platen roller cooperating therewith and adjustable relatively thereto, and a driven roller for frictionaily driving the platen roller.

16. In a bag making machine, means for weakening the bag material at bag length intervals, comprising in combination a weakening roller, a cooperating platen roller, a roller frictionaily engaging the platen roller for driving the same, and a throw-0E for said driving roller permitting separation of the platen and driving roller to facilitate threading of the machine.

17. In a bag making machine, means for weakening the bag material at bag length intervals, comprising in combination a weakening roller, a platen roller cooperating therewith, a roller engaging the platen roller frictionaily to drive the same, a common mount for the two last mentioned rollers, and means for adjusting said mount to vary the setting of the platen roller with respect to the weakening roller without interrupting the friction drive for the platen roller.

ADOLPH POTDEVIN.

CERTIFICATE OF commcg'xon. Patent No. 2,285,228. June 2, 191 2.

ADOLPH PO'I'DEVIN.

It is hereby certified that error appears in the printed specification of the above numbered patent reqairing correctionas follows: Page 2, sec 0nd column, lines 70 and 71, claim 5, strike out the words while the material and insert the same before "15" in line 69, same claim, and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this lLLth day of July, A. D. 1914.2.

Henry Jan Arsdale, (Seal) Acting Commissioner of Patents. 

